That should be easy to find. Most "find assasin" missions are timed. "Destroy stand" is also timed. But i would like to see a fix for the "detection". Now you are still detected but the sign doesn't show,so you can't begin any new missions,sice you need to be undetected to begin them.And how about a flag detector? Finding all the flags proves to be nearly impossible.

I believe the first timed mission that you'll get will be in Acre, it will be a rooftop race and two simple assassinations (2 bowman and 1 soldier).

For the rooftop race he's near a big open space where there's plenty trees and few guards, easy to find.

One is behind a building in the shadows, near the cliffs (where you can see the water) the other one is hidden near the market street (the one inside a building), there's a ladder near him and a white building.

Memory Block 3Acre: Northeast Informer To gain this informer's info you'll have to run through a course of flags, collecting them all and returning to the informer before 3 minutes has elapsed.

Jerusalem: Southeast Informer Another flag run, so collect them all and report back to learn that xxxxx followers will sacrifice themselves in order to buy time for their leader's escape.

Memory Block 4Damascus: West Informer Grab all 20 flags in three minutes and return to the informer to learn you can climb the fountain in the courtyard.

Acre: South Informer Grab all the flags in the allotted time to learn that xxxxxx to retreat to a secured location of the citadel if attacked.

Memory Block 5Acre: Northwest Informer You have four minutes to stealth assassinate five targets. Move quickly, killing fast and running away the moment the deed is done. You'll get a map showing the locations of xxxxx guards.

Southwest Informer You have three minutes to kill three targets, and one's on a rooftop, so climb up via a ladder to avoid suspicion. You'll receive info that xxxxx can be differentiated from the other scholars by his gold robes and large satchel.

Memory Block 6Jerusalem: Northeast Informer You have to kill five targets in as many minutes, and you can't let any of them see the bodies of the others. Move quickly from target to target and sit on a bench if a guard gets suspicious.

Once you load that save and load memory Block 3 it should start you off in the field (The Kingdom) and you need to travel to Jerusalem which on memory block 3 is the only city that still has quests still active in that save.

Once you arrive there do what jmscrft said:

Jerusalem: Southeast Informer Another flag run, so collect them all and report back to learn that xxxxx followers will sacrifice themselves in order to buy time for their leader's escape.

Edit: If you like I can upload a save inside Jerusalem so you start in the Bureau and that should save you some time rather then having to ride to the city, save that first citizen to gain entrance and then the informers don't appear until you climb the closes tower (and in this case the tower is hard to reach with guards blocking the entrance.

Also that informer is on the map in the due east of the Bureau you start in named "Informer Flag Challenge"

i am in jerusalem and i have interrogated the one guy but i keep failing the pickpocket mission. i see nothing that shows me any informants nor any races on the maps. not sure why i cannot pickpocket successfully either-